Why not a 21.6mm x 21.6mm sensor?

Started Jan 23, 2013 | Discussions thread
Klarno
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Re: Why not a 21.6mm x 21.6mm sensor?
In reply to Great Bustard, Jan 23, 2013

Great Bustard wrote:

The entire image circle for mFT lenses could fit within such a sensor. While such a sensor would be 25% larger than an APS-C sensor (468 mm² vs 372 mm²), it would still be barely more than half the size of a FF sensor, so I don't imagine the cost of the sensor itself would be an issue.

The advantages of such a sensor, however, are substantial: you would not need to rotate the camera from landscape to portrait orientation (especially convenient if using on-camera bounced flash) and you could crop to any aspect ratio you like with no IQ penalty.

So, what are the downsides that negate the upsides?

Lens hoods, especially petal or square lens hoods, are effectively configured for one aspect ratio; they should have some leeway, but going to a sensor shape that is different by that much you might get vignetting when trying to use supplied lens hoods at the lens' wider focal lengths (or only focal length, in the case of primes).

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